# Shared Flashcard Set

## Details

Motion
N/A
9
Science
01/31/2013

Term
 Motion
Definition
 is a change in postition measured by distance and time.
Term
 Speed
Definition
 tells us the rate sat which an object moves
Term
 Velocity
Definition
 tells the speed and direction of a moving object
Term
 Accerleration
Definition
 tells us the rate speed or direction changes
Term
 Gravity
Definition
 Force that pulls objects toward each other  Force of gravity can change an objects speed, directon or both
Term
 Law of Universal Gravitation
Definition
 All objects in the universe attract each other gravitational force. Depends on: th masses of the objects and the distance between them. Ex. Elephant and cat- easier to pick up a cat because its mass is smaller than elephants and therefore the gravitional for is smaller. Ex. Sun and you- sun is more massive that earth; gravitationl force doesn't affect us because distance between the sun and earth           as mass increases, gravitation Force ↑             as ditance increase, gravitional force↓
Term
 Weight
Definition
 measure of gravitational force on an object (here on Earth)               Weight changes when gravitional force changes
Term
 Mass
Definition
 is the amount of matter in an object-object's mass does not change Convert mass ot weight-multiply by 9.8 to convert weight to mass- divide by 9.8
Term
 Gravity and motion
Definition
 Objects fall to the ground at the same rate because the accerleration due to gravity is the same for all objects. A falling object accelerates at a constant rate- it falls faster and farther each second than it did the second before ( accerlation depends on both force and mass) Acceleration due to gravity is 9.8 m/s/s g=
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